#include <stdio.h>
//计算x~y之间的整数和
int qiuhe(int x, int y) {
	return y>x?y + qiuhe(x,y - 1 ):y;
}
int main()
{
	int sum =qiuhe(1,4);
	printf("he == %d\n",sum);
	return 0;
}